Who thought we’d ever see the day when Roger Toussaint — who crippled the city for 60 hours with an illegal transit-workers strike four years ago — would seem reasonable?

Yet Toussaint just lost effective control of Local 100 of the Transport Workers Union to hard-liners who damned him as a tool of MTA management.

“We are ready to face off against the MTA,” vowed John Samuelsen, the incoming president. “We have a common enemy, and that’s the boss.”

Good grief.

True, the 2005 walkout cost the TWU $2.5 million in fines and the loss, for nearly three years, of its coveted automatic-dues checkoff.

But Toussaint an MTA patsy?

He was, after all, the union’s rep on the arbitration panel that gave workers a budget-busting 11-plus percent wage hike over three years — a decision the MTA is rightly trying to overturn.

Still, New York unions have a long history of such rivalries: No matter how militant a union leader is, there’s always someone talking even tougher.

That’s especially true with the TWU, which once was headed by the fiery Mike Quill. Facing growing militancy by his membership, he bludgeoned the city and its weak new mayor, John Lindsay, into caving to his demands by staging a 12-day illegal strike back in 1966.

Fortunately for New Yorkers, Mike Bloomberg was no John Lindsay.

It remains to be seen, though, whether John Samuelsen sees himself as another Mike Quill.